That's why I suggested that you listen to it and decide for yourself.  Deciding that you won't like a headphone without hearing it is not very different from deciding that it's great without hearing it.  Try to give it a listen.  The results may surprise you. 
 
It's funny, I don't like the RS1 very much.  I find it's treble to be "piercing".  This was from listening to jp#'s vintage RS1 being driven by a top-notch source and amp.  After listening to that, I figured I must hate the Grado sound.  Then I tried an HP1 at a meet.  What a difference!  I really liked them.  I've since tried HP2 and PS1 phones.  Now I know that it's the John Grado sound I don't like.  My main headphone now is an HP2.  I'm sure glad I tried the HP1.